Originally Posted by Tony
by came loose, I mean the joists sit is sitting on the sill plate and is roughly 1 inch away from the band board.
I wonder if it was just a bad cut? Some framers will leave a mess that they think you will never find. If the cut is just short, there is no perfect solution. A splice on both sides would help. I wonder if the floor could be expanding enough make the popping noise there. The floor is attached to the rim joist. If the floor joist is close enough to the edge of the green plate, there could be enough movement to cause a noise. The floor joist could be crushing the inside edge of the green plate. OR, the floor joist could be crushing under the load due to the lack of integral support from the rim joist.
You might have a pro to look at it if you can't tell what caused the short joist.